Incandescent electric lamp



(No Model V i W. E. NICKERSON. INUANDESOENT ELECTRIC LAMP.

No 500,671. Patented July 4, 1:893.

5.23% Jig Z @fizzw 54 WW UNITED STATES PATENT OFFICE.

WILLIAM EMERY NICKERSON, OF CAMBRIDGE, MASSACHUSETTS.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 500,671, dated July 4,1893.

Application filed April 3, 1893. Serial No. 468,936. (No model.)

To all whom it may concern.-

Be itknown that I, WILLIAM EMERY NICK- ERSON, of Oambrid ge, in thecounty of Middlesex and State of Massachusetts, have invented a new anduseful Improvement in Incandescent Electric Lamps, of which thefollowing,

taken in connection with the accompanying drawing, is a specification.

My invention relates to incandescent electric lamps of that class inwhich the leadingin wires are not sealed in the glass, but are supportedby fusible cement which also serves to render the lamp air tight.

It consists in a device by which the heat from the incandescent filamentof the lamp is prevented from unduly heating and softening the cement.

In the accompanying drawing H represents the glass globe of the lamp, Ithe filament attached at 'i t' to the leading-in wires J J.

K is a disk of mica or other suitable substance resting upon a shoulderL formed in the neck of the lamp globe. This disk serves to partiallysupport the leading-in wires J J which pass through it at 70 7c and alsoto support the cement M by which the lamp is rendered air tight.

Below the disk K and at a distance of about one-half of an inch is asimilar, though smaller disk N through which the wires J J also pass andwhich rests upon a second shoulder 0 formed in the neck of the lampbulb. This disk N serves the purpose of arresting and reflecting backmost of the radiant heat from the incandescent filament which wouldotherwise strike the disk K and be largely absorbed by the cement M,tending thereby to soften and weaken the same, to the injury of thelamp.

Instead of the shoulder O the neck of the lamp globe may be made conicalat that part and the disk N allowed to slip down until it fits thegradually diminishing diameter.

I claim- 1. In an incandescent electric lamp, the combination of a glassglobe, the neck of which is rendered air tight by means of a fusiblecement, a filament and leading-in wires; with a heat-reflecting disklocated within the vacuous portion of the lamp between the filament andthat part of the neck of the lamp occupied by the fusible cement, saiddisk being adapted to reflect the heat of the filament and preventthereby the softening of the cement,substantially as and forthe purposeset forth.

2. In an incandescent electric lamp, the combination of the glass globeH, filament I, leading-in wires J J, disk K and cement M; with the diskN, located within the vacuous portion of the lamp between the filamentand the cement, said disk being adapted to reflect the heat of thefilament and thereby prevent it from softening the cement, substantiallyas and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 1st day of April, A. D.1893.

WILLIAM EMERY NICKERSON.

.Witnesses:

FRANK G. PARKER, FRANK G. HATTIE.

